Dynamo-electric machine.



W. A. TURBAYNE.

DYNAMO ELECTRIC MACHINE APPLICATION FILED MAY 31. 101D.

, gfi g. Patented Dec. 16, 1919.

2 SHEETS-SHEET I.

Fig.1

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B it known that L 11x11; BAYXE, a ciiizen 0f the Uniied 7 ing' at Iii; Falls, in 118 001.1% mi BT12 3 and sf fi'ew 3 131151 have fiilYfilltGCi naw and useful lmpmvemeni-s in Dynamoilleutric'ifiachinas 0? which fsilowing 2. specificatimi.

The preset i; inmntian relate-s i0 si'zilui'ig 2nd y iemting iyminioelectric nmchines.

.Tv'ioi'e particula ly the pi'asewb i 11"? relates in dynmns eiectric ZHRGililP- are used in the starting mid ligh isms of mimnobiles, in which 53's dymmw-elfictric machine is used as to start an internal combustion is adadted 50 be driven by said inieifnai com bustion engine to supply current for charging a storage battery. In such systems it isrequisitethat ciynamo-eiecti'ic machine should develop a high @orqne under meter ing conditions. It is alsq mquisitg that the dynamo-eles'hric machin'e also spemie efiicienbly as a, gel rater, iheu'gh the vii-Lie of tha CUZI'QZPE) out} i shouid be held inv1 s0 shat the miteryii 1y 110i be subjecieci =1 excessively high charging current.

The presem; invention ii'e'iatss 0 (iyname- -e1ec'tric machines i1], which said l'egiii. =1? actien is inhei'gii-fii within the m: bins itself. An object 015 the presems invention is t0 provide a dynzmuelectric ,machine which Win opexzi either a not-0r as a QQHGIMZGY.

A further object is m provue a, fiynamselectric machine which when acting as a gem ei'ator, will beinherently iegulatfid 0 11016 its :urrem output within. predetermined 11ml?) A 1 44; @iihe): abgests will be appareni; the 51escrip i110); proceeds Refining t0 the ciraxi ings Figiu'e 1 represenis an embndiment the presm'it invention.

2 represents diagramn'mtic iily iii (1'1" i'ec'tim'i of entrants in i; 10 Various annzv'dure conduciors.

For the purpose of simplifyingthe nation, embodiment 01' h piwent inven 39 tion has been chosen for 5H: 1a ion mnpio w in We poles It will be 0 him? th invontimi is. eqimliy a tipn hw form ii dynzunc- Rb fairing; pa ri-icuimrly tbelectric p012 pies Riding Ba n" 1 0i we seiies Wind ihm J mush 1% is cc-nnect- .i i Y ms the storhgebati automatie brushe: i2 and 142.

posed bei; L conducmis a i l in big. 1

and dots are used convention.

nectively that "-ne C1121 away from and i ward the Jilfid t0 operace as a motor e11 i aim:

-i the Mimi f line. Current Wifi 21150 p int W in a din The machi :01: a being roi riiieci. 4 i111 Nai and until the armature delivers current to the external circuit, the potential'difi'erence existin between brushes 12 and 14 will be ne ligi le, so that substantially the full deve oped voltage will be impressed across the shunt field winding. \Vhen the machine develops a voltage suflicient for charging the storage battery, the automatic switch will close in thewell known manner. Current will now be delivered to the battery 18 and the lamp circuit 19. The resulting armature reactionwill bring about distortion of the fiux in the direction of rotation. Consequently, the potential difference across brushes 12 and 14 will be increased, the potential on brush 12 predominating over that on brush 14. At the same time, the potential across brushes 14 and 13 will be reduced in the same degree, for the reason that the sum of the voltages existing across brushes 12 and 14 and 14 and 13 must equal the voltage across brushes 12 and 13. This action results in three effects which act to reduce the effective flux and therefore tend to hold the delivered output constant. First, there will be superimposed on the work circuit current flowing through the series oposing winding 16, the current which flows in the local circuit from brush 12 through the series winding adjustable resistance 17, brush 14 and armature conductors interposed between brushes 14 and 12. The demagnetizing current acting upon the opposing winding 16 will therefore be greater than the current in the external work circuit. Second, the reduction in voltage across brushes 13 and 14 will bring about a reduction in the current flowing in the shunt field winding 15. Third, the current in the armature conductors impressed between brushes 12 and 14 will exert a de-inagnetizing efi'ect, illustrated in Figs. 2 and 3. This is particularly well illustrated in Fig. '3, wherein said conductors are illustrated by the heavy crosses and dots.

One embodiment of the present invention has been described in detail for the purpose of illustrating the same. Many modifications will occur to those skilled in the art. It is desired to cover in this case all such modifications that fall within the scope of the invention as defii .ed by the appended claims.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is-

1. In a dynamo-electric machine, in combination, an armature provided with a pair of main brushes, a series winding connected at one end to one of said main brushes, an auxiliary brush, and a shunt winding connected between said auxiliary brush and the other of said main brushes, the other end of said series winding being connected to said auxiliary brush.

2. A dynamo-electric machine provided with a shunt winding and a series winding adapted to act differentially to said shunt winding during generating conditions, a pair of main brushes, and an auxiliary brush, said shunt winding being connected between said auxiliary brush and one of said main brushes and said auxiliary brush being electrically connected through said series winding to the other main brush.

3. A dynamo-electric machine provided with a rotatable armature, a shunt field winding and a series field winding adapted to act difi'erentially to said shunt field winding during generating conditions, a pair of main brushes, and an auxiliary brush spaced slightly behind one of said main brushes, said shunt winding being connected between. said auxiliary brush and one of said main brushes and said auxiliary brush being electrically connected through said series field winding to the other main brush.

1. A dynamo-electric machine provided with a shunt field winding and a series winding adapted to act differentially thereto during generating conditions, a pair of main brushes, an auxiliary brush, and a resistance member, said shunt winding being connected between said auxiliary brush and one of said main brushes and said series winding and said resistance meinber'being connected in series between said auxiliary brush and said other main brush.

5. A dynamo-electric machine provided with a rotatable armature, a shunt field winding and a series field winding ,"Cipted to act differentially to said shunt field winding during generating conditions. a pair of main brushes. an auxiliary brush spaced slightly behind one of. said main brushes, and a resistance men'iber, said shunt winding being connected between said auxiliary brush and one of said main ln'ushes and said series winding and said resistance member being connected in series between said auxiliary brush and. the other main brush.

6. An inherently regulated generator provided with a shunt field winding, a series field winding, an armature provided with conductors, said shunt field winding bein connected to be excited from certain of sai conductors, and an auxiliary circuit including said series field winding and the remainder of said conductors whereby said series field winding and said remaining conductors may oppose said shunt field winding.

In witness whereof, I have hereunto scribed my name.

WILLIAM A. TURBAYNE;

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